JPH0734763A - Air-curtain type draft chamber - Google Patents

Abstract

PURPOSE:To make it possible to effectively exhaust air in a treated room of a draft chamber without giving any unpleasant feeling to an experimenter and without disturbing air conditioning in the room by delaying the velocity of the wind of the air supplied from an air curtain box uniformly and on the average in the air-curtain type draft chamber. CONSTITUTION:An air-curtain box 7 is provided at the upper part of the front of a draft chamber main body 2, an air-supply duct 8 connected to the outside of a laboratory to supply the air forcedly is connected to an air supply port 9 formed on the surface thereof, and a lower side air feeding port 14 and a rear side air feeding port 15 are respectively to the lower side and rear side. As an air-keeping means of the air supplied forcedly from the air supply duct 8, resistance boards 21, 22 and 23 of a gas permeable material in a state to blockade a vent-line 10 in the air-curtain box 7 are so provided that a plurality of stages are made. The lowest stage of the resistance board 23 is provided in a state to incline it toward the front opening 3 of the draft chamber main body 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a draft chamber installed in a chemical laboratory or the like, and more particularly to an air curtain type draft chamber provided with an air curtain box above a front opening of the draft chamber. It is a thing.

[0002]

2. Description of the Related Art In a draft chamber, the inside of an opening provided in the front is used as a processing chamber, and the processing chamber is communicated with an exhaust means, so that odors, toxic gases and the like generated by chemical experiments conducted in the processing chamber are prevented. It is configured to be discharged to the outside of the laboratory by the exhaust means. When exhausting the processing chamber in the draft chamber, it is necessary to supply air to the processing chamber, and the air in the experimental chamber is introduced into the processing chamber of the draft chamber and exhausted together with the odor and toxic gas in the processing chamber. . For this reason, the air conditioning in the room that has been cooled or heated is disturbed, leading to a loss of energy for air conditioning. Therefore, in order to prevent the disturbance of the air conditioning in the laboratory due to the exhaust of the processing chamber in this draft chamber, an air curtain type draft chamber provided with an air curtain box connected to the air supply means above the front opening of the draft chamber. Is used.
The air curtain box communicates with the outside air by an air supply means such as an air supply duct, and the outside air supplied from the air supply means is supplied from an air supply port on the lower surface of the air curtain box from above the opening on the front surface of the processing chamber. The purpose of the present invention is to efficiently discharge the air from the processing chamber by blowing the gas and supplying it to the processing chamber, and at the same time, to reduce the energy loss due to the disturbance of the air conditioning in the room.

[0003]

However, the conventional air curtain box is a mere hollow box in which the air supply duct is connected to the upper surface and the air supply port is formed on the lower surface toward the opening of the processing chamber. Therefore, not only does the outside air with a temperature difference blow directly from above the experimenter's head at a high speed to cause discomfort to the experimenter, but the speed of the outside air supplied through the air curtain box is not constant and the air curtain From the air supply port on the bottom of the box, it spreads back and forth, left and right, and flowed into the laboratory, which rather disturbed the air conditioning in the laboratory.
Therefore, in the present invention, in the air curtain type draft chamber, the wind speed of the outside air supplied from the air curtain box is made uniform throughout, and is slowed on average, so that the experimenter does not feel uncomfortable, and the indoor It is intended to provide an air curtain type draft chamber capable of effectively exhausting the processing chamber of the draft chamber without disturbing the air conditioning.

[0004]

In order to achieve the above object, an air curtain type draft chamber according to the present invention is an air curtain type draft chamber having an air curtain box connected to an air supply means above a front opening. In the chamber, in the air curtain box, there is provided air supply retention means which is made of an air permeable material having air flow resistance and gives a pressure loss to the air supply from the air supply means. Furthermore, in the present invention, as the air supply / storing means, a resistance plate made of a breathable material is provided in a plurality of stages in a state of blocking the air passage in the air curtain box, and the bottom resistance plate is provided in the front opening portion of the draft chamber. (EN) An air curtain type draft chamber which is provided in a state of being inclined toward.

[0005]

In the air curtain type draft chamber according to the present invention as described above, the outside air forcibly supplied by the air supply means such as the air supply duct communicating with the outside is provided in the air curtain box. Due to the airflow resistance when passing through the air supply / retention means, the air supply speed becomes slower, and at the same time, the air is supplied from above the front opening of the draft chamber at a uniform and even speed. Further, in the case where a plurality of resistance plates made of a breathable material are provided as the air supply / holding means, the speed of the outside air supplied by the air supply means gradually decreases due to pressure loss due to the resistance plates of the plurality of steps. Further, the air is supplied from the air curtain box from above the front opening of the draft chamber at a more uniform air supply rate. Furthermore, by providing the lowermost resistance plate in a state of being inclined toward the front opening of the draft chamber, it is possible to prevent the air supply from the air curtain box from directly blowing on the experimenter's head, and at the same time, to prevent the outside air from being exposed. It is effectively supplied to the processing chamber, and the outside air having a temperature difference does not enter the laboratory and disturbs the air conditioning inside the chamber, and the draft chamber is efficiently exhausted.

[0006]

1 is a perspective view showing an embodiment of an air curtain type draft chamber 1 according to the present invention. In the figure, reference numeral 2 is a draft chamber body, and a front door 4 that slides up and down to open and close is provided in a front opening portion 3 of the draft chamber body 2, and the inside thereof is a process for conducting a chemical experiment or the like. A room 5 is provided. An exhaust duct 6 is provided on the upper surface of the draft chamber body 2 for communicating with the processing chamber 5 to forcibly discharge odors, toxic gases, etc. generated by chemical experiments in the processing chamber 5 to the outside of the laboratory. Is provided. Further, an air curtain box 7 is provided above the front opening 3 in the upper part of the front surface of the draft chamber body 2, and the upper surface of the air curtain box 7 communicates with the outside of the laboratory. An air supply duct 8 forcibly supplying the outside air is provided.

Inside the draft chamber body 2,
For example, as shown in FIG. 2, a partition wall 11 is provided in the inner part thereof, and an exhaust passage 12 communicating with an exhaust port 19 of an exhaust duct 6 opening on the upper surface of the processing chamber 5 is formed on the back side thereof. A louver 13 for adjusting the amount of air supplied into the processing chamber 5 to adjust the exhaust air from the exhaust duct 6 is attached above the front opening portion 3, and the front door is provided on the rear side of the louver 13. 4 is provided so as to be opened and closed vertically.

The air curtain box 7 is
As shown in FIG. 2 and FIG. 3, the air supply port 9 formed on the upper surface of the air curtain box 7 is connected to an air supply duct 8 that communicates with the outside of the laboratory to forcibly supply the outside air. Draft chamber body 2 on the bottom and back
A lower surface side air supply port 14 opening above the front surface opening 3 and a rear surface side air supply port 15 opening inside the processing chamber 5 are provided. A blind cover plate 16 made of a punching board or the like is attached to the lower surface side air supply port 14, and the rear surface side air supply port 15 is processed through a louver 13 provided in the front opening 3 of the draft chamber body 2. It is provided so as to communicate with the inside of the chamber 5. Further, according to the present invention, the air supply port 9 connected to the air supply duct 8 formed on the upper surface of the air curtain box 7 and the lower surface side are used as air supply retention means for the outside air forcibly supplied from the air supply duct 8. Resistance plates 21, 22 and 23 made of a breathable material are provided in a plurality of stages in a state in which the air passage 10 formed between the air supply port 14 and the back side air supply port 15 is closed, and the resistance plates 21, 22 and 23 are provided at the bottom. The resistance plate 23 is provided in a state of being inclined toward the front opening 3 of the draft chamber body 2. These resistance plates 21 to 23 can be attached and detached by opening the front cover 18 of the air curtain box.

Resistance plates 21 and 2 as the air supply retention means
3 is made of a breathable material such as a filter, a non-woven fabric, steel wool, etc., which is formed into a plate shape and is installed in a state of closing the air passage 10 of the air curtain box 7 to force the air supply duct 8 from the air supply duct 8. Ventilation resistance is given to the outside air supplied to the air curtain box 7. When the supplied outside air passes through the resistance plates 21 to 23, the ventilation resistance causes a pressure loss, and the lower surface side air supply port of the air curtain box 7 The outside air supplied from the air supply port 14 or the back side air supply port 15 is uniform throughout in both the depth direction and the width direction, the wind speed is uniform, and the air supply speed is slow on average.

FIGS. 4 to 7 show one of the resistance plates 20 as described above.
It shows an example and a method of making the same. The resistance plate 20 is obtained by cutting a mesh material 25, which is a breathable material, into appropriate lengths as shown in FIG. 5, folding it in two, and sewing the two sides into a bag shape. As shown, it is turned upside down, and after putting the frame 26 made of a wire or plate material such as an iron wire into the bag-shaped mesh ground 25 turned upside down, the opening is sewn or closed by a clip, a stapler or the like. . In this way, the resistance plate 20 is made of the mesh material 25.
It can be easily created by simply cutting a breathable material such as etc. into an appropriate size and inserting the frame 26, and not only the structure is simple and the cost is also reduced, but also the bag-like mesh material 25 and the frame 26 Since and can be created separately, changes in specifications can be easily handled. In addition, when the mesh ground 25 becomes dirty, the front cover 18 of the air curtain box is opened, the resistance plates 21 to 23 are taken out, and the frame 2 in the mesh ground 25 is removed.
6 can be removed and only the outer mesh fabric 25 can be washed at once and in large quantities, which is also advantageous in terms of maintenance.

The operation of the air curtain type draft chamber 1 according to the present invention configured as described above will be described below with reference to FIGS. 8 and 9. First, FIG. 8 shows a use state in which the front opening 3 of the draft chamber body 2 is completely closed by the front door 4. When the front door 4 is closed, the processing chamber 5, the ventilation part 10 in the air curtain box 7 and the laboratory room in which the draft chamber 1 is installed are communicated with each other through the gallery 13 above the front door 4.
Then, a part of the outside air A that is forcibly supplied from the air supply port 9 of the air curtain box 7 passes through the air passage 10 in the air curtain box 7 and the rear side air supply port 15 provided on the back side thereof. While being supplied to the processing chamber 5 of the draft chamber main body 2 from the portion through the louver 13, a part of the other outside air A is supplied from the lower surface side air supply port 14 provided on the lower surface of the air curtain box 7 to the front opening portion 3. The air is sent to the front and is similarly supplied into the processing chamber 5 from the louver 13 portion above the front opening 3. A small gap 31 communicating with the laboratory is formed below the front door 4.
The air B in the laboratory is also supplied into the processing chamber 5. Then, as described above, from the air curtain box 7 to the processing chamber 5
The outside air A supplied to the processing chamber 5 and the room air B supplied from the laboratory together with the air inside the processing chamber 5 are located above and below a partition wall 11 formed on the back surface of the processing chamber 5 and on an exhaust passage 12 on the back surface side thereof. Through the exhaust port 19 opened on the upper surface of the processing chamber 5 through the exhaust duct 6 and forcedly exhausted to the outside C. Further, as shown in FIG. 9, when the front door 4 for opening and closing the front opening 3 of the draft chamber body 2 is opened, the rear air supply port 15 of the air curtain box 7 is closed by the front door 4. . Therefore, the outside air A supplied from the air supply port 9 on the upper surface is the ventilation passage 1 in the air curtain box 7.
Through 0, all are blown out from the lower surface side air supply port 14 toward the front opening 3 of the processing chamber 5, and are supplied into the processing chamber 5 from the front opening 3. At this time, the air curtain box 7
Along with the outside air A supplied from the inside, the air B in the laboratory is also supplied into the processing chamber 5 at the same time. The outside air A and the air B in the laboratory supplied in this way are forcedly exhausted C out of the laboratory through the exhaust port 19 on the upper surface of the processing chamber 5 through the exhaust duct 6 as in the case described above.

Further, in the air curtain type draft chamber 1 according to the present invention, the outside air A having a high speed which is forcibly introduced by the air supply means such as the air supply duct 8 communicating with the outside of the laboratory is in the air curtain box 7. The air resistance is reduced by the resistance plates 21 to 23 of the plurality of stages provided in the air supply pressure to reduce the air supply speed, and at the same time, the resistance plates 2 to
By sequentially passing through 1 to 23, the gas is supplied from above the front opening 3 of the processing chamber 5 at a uniform and uniform speed.
Therefore, unlike the conventional air curtain box, not only does the high-velocity outside air blow directly above the experimenter's head to cause discomfort, but also the high-velocity outside air diffuses into the laboratory. It does not disturb the air conditioning in the room. Moreover, as the air supply / storing means, a plurality of resistance plates 21 to 23 made of a gas permeable material as in the embodiment.
With the provision of the outside air A supplied from the air supply duct 8,
Is gradually pressure-reduced by a plurality of resistance plates 21 to 23, and the speed gradually decreases in a stepwise manner, and is supplied from the air curtain box 7 from above the opening of the front surface of the processing chamber at a more uniform air supply speed. To be done. Furthermore, the lowermost resistance plate 2
By arranging 3 in a state of being inclined toward the front opening 3, the outside air A blown out from the air curtain box is prevented from being directly blown over the experimenter's head, and at the same time the outside air A enters the laboratory. Since the outside air A is efficiently supplied into the processing chamber 5 without entering and disturbing the air conditioning of the room, the exhaust of the processing chamber 5 can be effectively performed.

[0013]

As described above, according to the air curtain type draft chamber according to the present invention, the air curtain box is made of a breathable material having a ventilation resistance, which causes a pressure loss to the air supplied from the air supply means. Due to the provision of the air supply retention means for providing, the outside air that is forcibly introduced from the air supply means such as the air supply duct is provided in the air curtain box when passing through the air curtain box. The air supply pressure is reduced by receiving the air flow resistance by the air retention means, and the air supply speed of the outside air blown out from the supply air curtain box is slowed down. There will be no speed. Therefore, unlike the case of the conventional air curtain type draft chamber, the outside air is not blown out into the experiment room to disturb the air conditioning in the room, and it is possible to prevent the energy loss of the air conditioning at the same time as the experiment. There is no possibility that the outside air will be blown strongly from above the person's head to cause discomfort to the experimenter. Furthermore, in the case where a plurality of resistance plates made of a gas permeable material is provided as the air supply / storing means, the external air supplied by the air supply means is reasonably stepwise due to pressure loss when passing through the plurality of resistance plates. The air velocity was slowed down, and the air was blown from the air curtain box from above the front opening of the draft chamber at a more uniform air supply rate, and the lowermost resistance plate was inclined toward the front opening of the draft chamber. When installed in this state, the air sent from the air curtain box is sent toward the opening in the front of the processing chamber, so that it is possible to prevent the air from directly blowing on the experimenter's head, which has a temperature difference, and at the same time, to prevent outside air Air is not diffused into the laboratory and disturbs the air conditioning in the room, and the outside air supplied from the air curtain box is efficiently supplied to the draft chamber processing room. It is possible to evacuate the processing chamber of the chamber effectively.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of an air curtain type draft chamber according to the present invention.

FIG. 2 is a simplified side sectional view of the draft chamber.

FIG. 3 is an enlarged side sectional view of an air curtain box portion.

FIG. 4 is a vertical cross-sectional view showing one embodiment of a resistance plate.

FIG. 5 is a perspective view showing a method for producing the resistance plate.

FIG. 6 is a perspective view showing a method of manufacturing a resistance plate.

FIG. 7 is a perspective view showing a method for producing a resistance plate.

FIG. 8 is a side sectional view of a main part for explaining the state of air supply and exhaust with the front door closed in the draft chamber according to the present invention.

FIG. 9 is a side sectional view of an essential part for explaining the state of air supply and exhaust when the front door is also opened.

[Explanation of symbols]

1 Draft Chamber 2 Draft Chamber Main Body 3 Front Opening 4 Front Door 5 Processing Chamber 6 Exhaust Duct 7 Air Curtain Box 8 Air Supply Duct 9 Air Supply Port 10 Ventilation Path 11 Partition 12 Exhaust Path 13 Gallery 14 Bottom Side Air Supply Port 15 Rear Side air supply port 16 Blind plate 18 Front cover 19 Exhaust port 21 Resistance plate 22 Resistance plate 23 Resistance plate 25 Mesh ground 26 Frame A Outside air B Indoor air C Exhaust air

Claims (2)

[Claims] 1. An air curtain type draft chamber having an air curtain box connected to an air supply means above a front opening, wherein:
An air curtain type draft chamber characterized by comprising an air supply retention means which is made of an air permeable material having air flow resistance and gives a pressure loss to air supply from an air supply means. 2. A resistance plate made of a breathable material is provided in a plurality of stages as an air supply / holding means in a state of blocking an air passage in the air curtain box, and the lowermost resistance plate is directed toward the front opening of the draft chamber. The air curtain type draft chamber according to claim 1, wherein the draft chamber is provided in an inclined state.